Lemma 2.5 ([1]})   Suppose that \(D\subset G\text{\textnormal {-Hilb}}\,\mathbb {A}^3\)  is an irreducible exceptional divisor marked with a character \(\psi \) . Then all \(\theta \in \mathfrak {C}_0\)  satisfy the inequality
\(\theta \big (\varphi _{\mathfrak {C}_0}\big (\mathcal {R}_\psi ^{-1}|_D\big )\big )=\theta (\psi )>0.\) 
